Drill



A. L. HAWKESWORTH.

DRILL.

APPLICATION FILED SEPT. 19. 1921.

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DRILL.

APPLICATION nuzn SEPT. 19. 1921.

M22364 Pawhted July 11, 1922.

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N VEN Tee Arthuriliaw/reswri/i Z MW A. L. HAWKESWORTH. DRILL.

APPLICATION FILED SEPT. 19, I921. 1,42, Patented July 11, 11.922.

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4 onthe bar or shank while in service, and

.- shank for safekeeping in a tool chest, or

' detached for purposes of sharpening, for b a any other provide a bit the cutting edges of which will I not all follow inthe same path, thus increasv and State of M tain new and provements in an mus, n nawxnswoa'rn, or BUTTE, woman-a.

DRILL.

aeeaeea To all whom it com-em." I

Be it known that I, ARTHUR L. HAWKES- WORTH, a citizen of the United States, re-

siding at Butte, in the county of Silverbow ontana, have invented ceruseful Improvements in Drills, of which the following is a specification.

e present'inventlonis directed to imdrill s,'and-has for its object to provide a detachable bitor' cutting end 1 for a dIlll bar or shank for the purpose of wedge at any hard substance object is to provide bit in such a way whatsoever. A further means for fastening the asto insure its retention yet permit instant removal of the bit when desired, as for. example when it becomes necessary to detach an old bit and attach a new one, or' when a .bit is removed from the urpose. Further objects'are to ing the speed ofthe cutting action; one having a water hole in the shank offset from that in the bit not to get pluggednp so as, with dirt or cuttings; and one possessing further and other features, the advantagesof which ;will be fully apparent from .the following detailed description in connection with the accompanying drawings, in which- Figure 1 represents an elevation of a drill .turned so as to present the large end of the the top of the tongue of the shank and the small end of dove-tail groove in the tongue engaged by the corresponding groove an -tongue on 'the bit; Fig. 2 is a. side elevation of the drill with parts broken away; Fig. 3 is an GIQVHISlOIL'Of the bit detached rom thev shank and turned the same as in v bit turned to present represent amodi-fi Fig. 15 Fig, 4 isan elevation of the shank, turned thesame as in 1;, 5 is a Fi bottomplan of thebit; Fig. 6 1s an end view ofthe shank showing minal tongue thereof received by the groove in plan the terof the bit,- Fig. 7 elevation of the opposite cutting edges 8 is a side elevatlon bit removed; Fig.9 is a top plan of the bit showing the cutting edges centered outside the rotation axis with relation-to the shank;v Figures '10 and 11 i ed form ofbit and shank,

the water-hole ofi'set being in the shank inis a side of unequal length; Fi

opposite that from which end of the may be disposed at grooves they will walls w Patented July 11, 1922. Serial No. 501,585.

stead of in'thebit; Figures 12, 13, 14, 15, 16 and- 17 are views similar to Figures 1, 3, 4, 5, 7 and 8 respectively, showing, however, and groove are replaced by a with parallelsides.

eferring to the drawings, 1 represents a drill-bar .orshank provided or axial passageway or duct w for the flow water or air usually employed in drilling a modification wherein the taper ng tongue operations as well understood in the art. drilling holes in rocks, in the ground, or .in T

he shank terminates at one end (the end the same is operated) in a tongue 2 which is inclined to ward the bit or away from the operating shank. The side walls of the tongue 2-are provided with dove-tail grooves g tapered the length of the tongue toward the operating end of the'shank, i. e. the wide ends of the grooves are toward the bit, or cuttingend of the tool. 'The tongue 2 is ounded by offsets t, t, disposed in a common transverse plane inclined to the axis of the shank, said plane being parallel to the plane of the top face it of the tongue. The tongue 2 has a groove'depression a on its face h, said roove communicating with duct a in the s ank. Theoifset groove 71 need not be in the shank, but may be in the bit, or it around the shank as in Figures 10 and 11. The offsets t, 27, and face Inform-the supporting surfaces for-the detachable bit 3 which is formed with a groove d for receivin the tongue 2 of the shank, said groove con orming in inclination with said tongue, the inner faces of the bounding or side wallsw whereof engage the sides of the tongue, said faces having dove-tail tongues e, e adjacent their lower-edges, said tongues being tapered to conformwith" the taper of the grooves in the shank which receive said tongues. Obviously the wide ends of the grooves g, 9' receive the narrow ends of-th'e tongues e, e,

and as the tongues ride downwardly in-the until firmly wedgeg in place, at which time the shank and bit are in alinement and top face m of k of the tongue 2, and bottom faces 12., n of will bear ontheofi'sets t, t. It hvilh be seen fromthe foregoing that a pressure on the-shank in the line of the axis thereof will tend to drive the drillin .end-

shahk upwardalong the inclined plane of the groove bottom, or what amounts to the with a central e5 an angle anywhere adually become tighter the groove at will bear 'on' ta face Of the 111% same thing, tend to force the bit downward along the inclined plane of the face h of the tongue, thereby tending to tighten the bit on the shank during the drilling operation rather than to loosen it. On the other hand, to detach the bit from the shank all that is necessary is to tap the bit on the side of the narrow ends of the tongues e thereby forcing the bit across the longitudinal axis of the shank toward the wide end of the grooves g, or in the direction shown by the arrow in Fig. 2, the bit readily slipping off the tongue.

The cutting edges, it will be observed (Fig. 9), are not all the same length, two adjacent edges 7', 1-, being shorter than the opposite edges 1", 1", and said edges converging at a po1nt oifset from the center of the shank. The object of thus disposing the cutting edges of the bit is to increase-the cutting speed of the bit and at the same time prevent the clogging of the port a by chips or dirt. Then too, any core that might be left by theshorter edges 1', 1' would be cut off by the edges 7*, 1-. A port a, traverses the bit fIOIQ thG intersection of the cutting edges to a polnt where said port a will communicate with the offset groove 71 out of alinement .With port 0, thus preventing dirt or cuttings from entering said port and clogglng the same.

In the modification, Figures 12 to 17 inclusive, I provide ribs w on the inside walls of the groove d of the bit, said ribs being of uniform width throughout their length but inclining on' the walls. The shank "has corresponding grooves g in the tongue 2 for receiving theribs. In this formthe wedgmg action takes place between the tongue 2 and groove d. i

It would, of course, fall within the spirit of my lnvention to reverse the tongues and grooves, the reversal of the positions of these parts being in no Wise a departure from the generic idea contemplated by the invention. The invention is, of course, applicable to any reciprocating or rotating shank, bar, or other member employed for drilling or borlng purposes, to which a bit or cutting end may be applied and to which it may be detachably secured.

It Wlll be seen from the foregoing that the coupling means Joy-which the bit is secured to the drill bar or shank is such as to cause the bit to be locked or tightened to the shank by a relative movement of the parts across the axis of the shank in a given di- 0 rection, thebit becoming loosened from the shank by a corresponding movement of the parts in the opposite direction.

Having described my invention, I claim: 1. In combination with a drill-bar or shank terminating at one end in a tongue, the side walls of which are provided with grooves having one wall inclined to the a direction so as to tighten on the shank during the drilling operation, said shank being provided with a port throughout its length, said bit also being provided with a port offset from the port in the shank and communicatin therewith.

3. In comblnation with a drill-bar or shank, a detachable bit cooperating therewith, said bit being provided with a series of cutting edges converging to a point eccentric with the center of rotation of the shank, said shank and bit being traversed by a water-hole having an outlet at the convergence of the cutting edges.

4. In combination with a drill-bar or shank, a bit movable across the axis of the shank and detachable therefrom, said biz being provided with a series of cutting. edges of non-uniform length and converging to a point outside the geometrical center of the cutting face of the bit.

5. In combination with a drill-bar or shank, a bit movable across the axis of the shank and detachable therefrom, said bit being provided with a series of. cutting edges of non-uniform length and converging to a point outside the geometrical center of the bit, said shank being traversed by a port from end to end, and the bit having a port extending from the center of the cutting edges to a point offset from the port in the shank, the aforesaid portsbeing-connected by a by-pass.

6. In combination with a drillbar or shank terminating at one end in a tongue, the sidewalls of which are provided with grooves having one wall inclined to the shank offset at the base of the tongue, a bit movable across the axis of the shank and provided with an open ended groove to receive the aforesaid tongue, ribs projecting from the walls of said groove for cooperating with the grooves on the side Walls of the shank tongue, and cutting edges on the bit, opposite said open ended groove, said cutting edges converging to a point eccentric with the center of rotation of the shank.

7. In combination with a drill-bar or shank terminating at one end in an inclined tongue, ,the side walls of which are provided with grooves having one wall inclined to the ceive the tongue, r1bs projecting from the shank terminating at one end in a tongue walls of said groove for cooperating with the grooves on the tongue to effect a tightening of the bit on the shank during the drilling operation, the aforesaid bit having a plurality of cutting edges of non-uniform length opposite the groove and a port extending therethrough from the cutting edges to the base of the groove, the aforesaid shank also having a port extending longitudinally therethrough and out of alinement with the port. in the bit,said ports being in communication.

8. In combination with a drill-bar or shank, a bit detachably mounted thereon, said shank having a water-hole extending longitudinally therethrough, and the bit also being provided with a water-hole extending in the same general direction with that of the shank butout of 'alinement therewith.

9. In combination with a drill-bar or disposed at an incline with relation to the axis of the shank, the side walls of said tongue being provided with grooves having one wall inclined to'the shank ofi'set at the in the side walls of the shank tongue to tighten the bit on the shank during the drilling operation, the shank tongue having a depression in its top 'face and a longitudi nally disposed port communicating with one end of said depression, and the bit having a port extending axially therethrough communicating with the opposite end of said depression. I

In testimony whereof I hereunto afiix my signature.

A'R-THUR L. HAWKES'WORTH. 

